Vacuum/ Throttle Help - 1976 300D (W115)

[jondoe0069]

Can anyone help me identify some things here? Please see the attached picture.

I did a Valve adjustment this weekend and ended up snapping a brittle vacuum connector that splits off a large hose that comes off the pump to some smaller hoses that go to the shut off solenoid, inside the car, and to the object labeled "A" in the attached photo. That piece also has a cable that attaches to the throttle linkage (see "B"). I have a couple of questions:

1. What is that large black cylinder shaped part ("A")?
2. While you're at it, what is the part labeled ("C")?

By the way - this is all on the passenger side of the engine compartment, closes to the firewall. The angle of the picture is looking straight down, standing on the passenger side of the car.

I am going to replace the connector next weekend to get vacuum pressure flowing again, but for right now, when I started my car, I barely got any throttle response from the pedal. When I engaged the throttle by pushing on the linkage, it was excellent.

Could the part in the picture ("A") be what's causing this if it has no vacuum going to it? Or do I need to adjust the linkage somehow? I did remove the linkage to do the valve adjustment, but I put it all back on right as far as I can tell (I took several pictures during the process).

Any help is appreciated! Also, if anyone knows of a vacuum schematic for this car, that would be awesome! The guy who owned it before me cut the vacuum lines in multiple places and just plugged them up. I'm not sure how to reconnect everything now.

Thanks!!